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This is actually the answer of @berak, but their post disappeared...

One should only convert the .wS1 (etc) model files into .wS1.yml.gz. It is possible with the following code:

bool matRead(const string& filename, Mat& _M){
    FILE* f = fopen(filename, "rb");
    if (f == NULL)
        return false;
    char buf[8];
    int pre = fread(buf,sizeof(char), 5, f);
    if (strncmp(buf, "CmMat", 5) != 0)  {
        printf("Invalidate CvMat data file %s\n", filename);
        return false;
    }
    int headData[3]; // Width, height, type
    fread(headData, sizeof(int), 3, f);
    Mat M(headData[1], headData[0], headData[2]);
    fread(M.data, sizeof(char), M.step * M.rows, f);
    fclose(f);
    M.copyTo(_M);
    return true;
}

int main(int argc, char**argv) {
    cv::String node = argv[1];
    cv::String ext = argv[2];
    Mat m;
    if (matRead(node + ext, m)) {
        FileStorage fs(node + ext + ".yml.gz", 1);
        fs << node << m;
        fs.release();
        return 0;
    }
    return 1; // fail
}